Applications of Photorefractive and Resonant Systems to Optical Signal Processing..
Abstract
The experiments done in this grant can be broadly classified into two stages. The goal of both these stages was to demonstrate all-optical high-speed turbulence aberration correction through nonlinear optical phase conjugation. The first stage involved the development of a phase conjugate mirror (PCM) based on non-degenerate four-wave-mixiag (NDFWM). Coherent population trapping (CPT) in sodium vapor permitted the use of low intensity cw lasers. The second stage involve the development of a phase conjugate resonator (PCR) that could correct intracavity aberrations. In comparison to the PCM using CPT, the PCR was also based on CPT but was degenerate in optical frequency, with a simpler experimental set-up. A high conjugate power gain exceeding 35 was achieved in both the non-degenerate and degenerate FWM configurations. Hi gain is of importance in applications involving wide apertures. Experiments were demonstrated using a helium jet in air operated at a frequency of 18kHz with flow speeds up to 25Om/s. Substantial reduction in the modulation depth of temporal aberration is shown for both the PCM and PCR cases, along with high-fidelity spatial aberration correction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1999
- Accession Number
- ADA367740
Entities
People
- Mark Cronin-golomb
- Venkatapuram S. Sudarshanam
Organizations
- Tufts University